void change(double *matrix, int rows, int cols, double constant, char sign);
double* transpose(double *matrix, int rows, int cols); //转置
double determinant(double *matrix, int n, double shu); //行列式
void inverse(double *matrix, int n, double shu); //逆矩阵
double *pass(double *matrix, int n, int a, int b); //去掉行列
void choose(double *matrix, double shu, int rows, int cols);
